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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Jan. 02, 2018
Lessee, Lease, Description [Line Items]      
Base lease term (in years) 10 years    
Operating lease rent expense $ 40.8 $ 41.7 $ 43.9
Options to extend lease term included in operating lease payments 158.8    
Minimum lease payments for leases signed but not yet commenced $ 11.0    
Minimum      
Lessee, Lease, Description [Line Items]      
Lease extension term (in years) 5 years    
Maximum      
Lessee, Lease, Description [Line Items]      
Lease extension term (in years) 15 years